Lords of the Ring

[Grumpy]

I was just implying that it should not be left unattended unless protected from itself.

[mrl]

I was thinking of opamp voltage level detection with the single pole relay connected from the +12 to the feedback relay. But my concern now is that when the relay breaks contact then I have the coil acting as an open ended transmission line in a runaway state. I could try disconnecting that first just to see, but I don't have the runaway state.
No shortcuts, eh?
I can still use the level detector.

tnx, giantkiller.
[/quote]

You can use an MOV or zener as your trip sensor.  When the voltage goes over the threshold then it can trip a relay latch system that cuts the power to your supply.

Use a small micro power 5V relay as your trip relay that runs a bigger power relay.

[giantkiller]

I was thinking of opamp voltage level detection with the single pole relay connected from the +12 to the feedback relay. But my concern now is that when the relay breaks contact then I have the coil acting as an open ended transmission line in a runaway state. I could try disconnecting that first just to see, but I don't have the runaway state.
No shortcuts, eh?
I can still use the level detector.

tnx, giantkiller.
*******************


You can use an MOV or zener as your trip sensor.  When the voltage goes over the threshold then it can trip a relay latch system that cuts the power to your supply.

Use a small micro power 5V relay as your trip relay that runs a bigger power relay.

Tnx. The relay is what I am going to do.
Be cheaper than fuses at this point.

Last night I coiled(7 turns, doesn't matter) 8 gauge Easyflow audio cable inside my GK4 (TPU#4)and brought both ends out in parallel. I then touched my 1st finger to one end and my favorite finger to the other end. When I changed freqs I notice little random muscle contractions in my lower outer arm at different places. Random though, but there is an application of some sorts.
Just sit in the control seat, turn it on and go to phenominal places on an amazing journey!

--giantkiller.

[mrl]

My thinking is there is no way to get around the fact there are two coils 90 Degrees apart, movement of charge(electrostatic)- radiant event like Edwin Gray and Tesla used is the only way I can think of. This means current rise and fall times must be extremely small and abrupt, which semiconductors probably will not handle well. To Giantkiller--- I read as well that longer durations or impulses can be BAD for you.
I do not think FET's or 555's will do the job here, notice the time function mentioned above - 100 nanoseconds at probably hundreds of amps.

I found a good analogy for this, something called a water hammer pump. A long pipe carries moving water and a valve on the end opens and closes abruptly. When the valve closes the momentum of all the water in the pipe is converted to pressure at the valve,this opens a check valve and high pressure water is ejected-from a low pressure source.    Now---- imagine a wire or coil with current(water) flowing in it and the switch is opened abruptly-valve on end is closed. With nowhere to go the energy will burst from the wire(pipe). It will always move perpendicular to the source outward, BUT ----it will only do so if there is enough current flow(momentum) and only if the switching is extremely abrupt. I don't think any of these conditions have been met from what I have read, But damn I think your getting close.
Super fast switching- no reversal may be the ticket

MOSFETs will turn on and off in a matter of nanoseconds.  An IRF 840 will have a switching on/off time of about 20 nanoseconds.  This should be good enough.  You just need a precision pulse generator.  You need to control your frequency and duration parameters more precisely.  A 555 timer will not give you the rise and fall times that you need unless you pump its output through a MOSFET driver, and even then your not going to get the duration control that you need.

[CTG Labs]

GK,

Here is my new TPU as close to your specs as I could.  I am not sure what no this one is, I think its TPU v7.0, but I lost count of of how many I made so its the GK version!


D.